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go to the application> show package content> content> resources> transgaming> c-drive> program files> electronic arts> the sims 3> game> Bin> Then open Default.ini with text edit. Scroll all the way down to the bottom where it says GameVersion = 1.8.25.003001 change the end one to 2 or whatever works for you like this GameVersion = 1.8.25.003002 then close and save. And that's it.

I can not find these files on my MacIntosh. Can someone assist ? We need to be able to change the regional settings of the original the sims 3 game to be able to install the sims world adventure extension